Perhaps you should try some spelling variations:
"coder coder gray value problem" » "coder coder gray value problems" (Expand search), "coder decoder gray value problem" (Expand search), "code code gray value problem" (Expand search), "decoder codec gray value problem" (Expand search), "coder coder gray values problem" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder gray value problem\") OR (\"_ python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder gray value problem ) OR ( _ python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder gray value problem") OR ("_ python python python programming"))*.